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M2 Technical Topics > Mechanical Maintenance: Break-in | Oil & Fluids | Servicing | TSB | Recalls > Rear differential recall replacement service

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      05-02-2017, 10:34 PM   #1
dasblack
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Rear differential recall replacement service

To anyone who had a defective rear differential replaced, did you get your car serviced after breaking in the rear diff? I ask because at 1,200 miles BMW changes rear diff fluid.

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      05-03-2017, 06:15 AM   #2
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Quote:
Originally Posted by dasblack View Post
To anyone who had a defective rear differential replaced, did you get your car serviced after breaking in the rear diff? I ask because at 1,200 miles BMW changes rear diff fluid.

Thanks,


Brian
Yes, if your differential was replaced, you have to do another 1,200 mile service on it and observe the proper break-in procedures during that time.

PS: mine was, but during the period it was mandatory, so the first diff never even got broken in.
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      05-03-2017, 12:26 PM   #3
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Originally Posted by gmzanatta View Post
Yes, if your differential was replaced, you have to do another 1,200 mile service on it and observe the proper break-in procedures during that time.

PS: mine was, but during the period it was mandatory, so the first diff never even got broken in.
Mine was replaced at about 1000 miles under recall. Got my 1200 BI service done then.

The diff fluid needs to be replaced at 2200 miles( 1200 miles after new diff put in).

I still can't completely get on it to allow the new diff to "breakin".

I did however have car on the track just before the old diff was replaced.

There is some controversy on these forums about the M2 1200 mile breakin. Seems the M2 1200 mile breakin service is more for the M diff than for the engine. M235 doesn't have the same 1200 service IIRC! M3 and M4 do also but they may also undergo ECU reprogrammed to increase power and rev limit.

It is confirmed that the M2, aside from Launch control in DCT, has NO ECU power or rev limitations removed at the 1200 mile BI service
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      05-03-2017, 03:43 PM   #4
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Quote:
Originally Posted by reppucci View Post
Mine was replaced at about 1000 miles under recall. Got my 1200 BI service done then.

The diff fluid needs to be replaced at 2200 miles( 1200 miles after new diff put in).

I still can't completely get on it to allow the new diff to "breakin".

I did however have car on the track just before the old diff was replaced.

There is some controversy on these forums about the M2 1200 mile breakin. Seems the M2 1200 mile breakin service is more for the M diff than for the engine. M235 doesn't have the same 1200 service IIRC! M3 and M4 do also but they may also undergo ECU reprogrammed to increase power and rev limit.

It is confirmed that the M2, aside from Launch control in DCT, has NO ECU power or rev limitations removed at the 1200 mile BI service
Overboost supposedly is enabled, but that has been disputed.
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      05-03-2017, 05:58 PM   #5
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Overboost supposedly is enabled, but that has been disputed.
Is there any way to even know if they enabled anything like that or not?
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      05-03-2017, 11:06 PM   #6
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Hmm, that's what I thought too but my service adviser said I didn't. I asked BMW genius about it but they said speak with my service adviser....
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      05-04-2017, 06:41 AM   #7
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Quote:
Originally Posted by reppucci View Post
Mine was replaced at about 1000 miles under recall. Got my 1200 BI service done then.

The diff fluid needs to be replaced at 2200 miles( 1200 miles after new diff put in).

I still can't completely get on it to allow the new diff to "breakin".

I did however have car on the track just before the old diff was replaced.

There is some controversy on these forums about the M2 1200 mile breakin. Seems the M2 1200 mile breakin service is more for the M diff than for the engine. M235 doesn't have the same 1200 service IIRC! M3 and M4 do also but they may also undergo ECU reprogrammed to increase power and rev limit.

It is confirmed that the M2, aside from Launch control in DCT, has NO ECU power or rev limitations removed at the 1200 mile BI service
Well not quite...the motor itself is broken in from WOT testing at factory, HOWEVER, the M diff and the remainder of the drivetrain components do have to be broken in.

But as you said, the M diff if by far the most important part of that puzzle.
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      09-14-2017, 01:09 PM   #8
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So my car is getting the diff replaced now. I asked my service advisor if the 1200 mile break in service was required for the new diff and he said that it was, but I did not have to keep the car under a specified rpm/speed as that was for the engine only.
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      11-25-2017, 03:23 PM   #9
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Quote:
Originally Posted by twin fed View Post
So my car is getting the diff replaced now. I asked my service advisor if the 1200 mile break in service was required for the new diff and he said that it was, but I did not have to keep the car under a specified rpm/speed as that was for the engine only.
What is your build date?
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      11-28-2017, 11:47 AM   #10
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      09-24-2020, 10:21 AM   #11
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Quote:
Originally Posted by twin fed View Post
So my car is getting the diff replaced now. I asked my service advisor if the 1200 mile break in service was required for the new diff and he said that it was, but I did not have to keep the car under a specified rpm/speed as that was for the engine only.
How is your car now? I just got my diff replaced under warranty and the SA told me that I have to re-do the break-in procedure again...
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      09-25-2020, 07:00 PM   #12
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Quote:
Originally Posted by Q_Subsub View Post
Quote:
Originally Posted by twin fed View Post
So my car is getting the diff replaced now. I asked my service advisor if the 1200 mile break in service was required for the new diff and he said that it was, but I did not have to keep the car under a specified rpm/speed as that was for the engine only.
How is your car now? I just got my diff replaced under warranty and the SA told me that I have to re-do the break-in procedure again...
Quote:
Originally Posted by Q_Subsub View Post
Quote:
Originally Posted by twin fed View Post
So my car is getting the diff replaced now. I asked my service advisor if the 1200 mile break in service was required for the new diff and he said that it was, but I did not have to keep the car under a specified rpm/speed as that was for the engine only.
How is your car now? I just got my diff replaced under warranty and the SA told me that I have to re-do the break-in procedure again...
The car is fine and has been since the replacement. In fact I completely forgot that I had it done. But yeah you do have to do the break in process all over again. But like I said prior, you don't have to keep it under a certain speed or rpm that was only for the engine.
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